<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <script>
        function Star(uname, age) {
            this.uname = uname;
            this.age = age;
        }
        Star.prototype.sing = function () {
            console.log('唱歌');
        }
        Star.prototype.sex = '女shi a';
        // Object.prototype.sex = '男';

        var ldh = new Star('刘德华', 18)
        ldh.sex = '男';
        console.log(ldh.sex);
    </script>
</body>

</html>